LG sk4d repair - component identification

[virusman]

Hello to everyone.
I'm reparing a soundbar from LG, model sk4d.
Broken component looks like a dc/dc voltage converter.
SMD marking code is AVXK in firs line, and 385 in second line. See attached photo. Any info about this component will be very usefull.

[fzabkar]

Maybe you can find a service manual for a similar product here?

http://www.jordansmanuals.com/default.aspx?Brand=LG&Product=Home%20Theatre%20Sound%20Bar

[Mario87]

First question is what makes you think that particular component has failed? What has drawn you to that conclusion?

[wraper]

It looks overheated as minimum.

[wraper]

Yes this looks like DC/DC converter. Also marking looks like it should be from MPS (Monolithic Power Systems).

[wraper]

Device code supposedly is AVX, K is a year and the bottom row is a lot number.
EDIT: also I think device number should be somewhere in MP16xxGTF range. Unfortunately many devices in that range do not have a datasheet available and I cannot find photos either.

[Mario87]

It looks overheated as minimum.

Actually, after another look, not only does it look like it's overheated I think there is a small crack at the bottom of the number 3

[wraper]

In the end I think it's likely MP1602GTF-xx (fixed voltage version) with voltage suffix unknown to me but you can figure out it from what it is powering, and checking if there is a feedback divider (for adjustable version) or not. See MP1601 datasheet for pinout and schematic (page 19) as it likely does match. Similar to MP1601 third letter in device code likely indicates voltage suffix. https://www.monolithicpower.com/en/mp1602.html
Checked many of ICs:
Unknown: MP1602, MP1603, MP1614
Certainly not:
MP1601
MP1605
MP1606
MP1651
MP1652
MP1653
MP1654
MP1657
MP1658
MP1660
MP1470
MP1476
MP1476L
MP1477
MP1477H
MP1479
MP1488

[fzabkar]

I notice that MP9161AGJ (an 8-pin IC) uses the same marking code (AVCy) as the 6-pin MP1602.

https://www.monolithicpower.com/pub/media/document/MP9161A_r1.01.pdf